Synthesis of cationic polysaccharide (Aloe) Schiff base surfactants was described and their chemical structures were confirmed by using FTIR spectroscopic, H-NMR and UV analysis. The surface activities of these surfactants were measured, including surface tension, critical micelle concentration, effectiveness, efficiency, maximum surface excess and minimum surface area at 25°C, interfacial tension and emulsification power at 25°C. Adsorption and micellization free energies of these amphiphiles in their solutions showed a good tendency towards adsorption at the interfaces.
SIX series of cationic polyurethane surfactants were synthesized by the reaction between different six esters (which prepared by condensation of fatty alcohols namely: octanol, decanol, dodecanol, tetradecanol, hexadecanol and octadecanol with bromoacetic acid) and polyurethane as quaternizing agent. The chemical structures of these surfactants were confirmed using elemental analysis, FTIR spectra, + HNMR and UV analysis. The surface activities of the synthesized cationic thiol polyurethane surfactants showed their tendency towards adsorption at the air/water interface. The adsorption tendency was estimated from the values of surface tension and the depression of surface tension at the critical micelle concentration. The studied surfactants were evaluated as antimicrobial agents against pathogenic and sulfur reducing bacteria using inhibition zone diameters and minimum inhibition concentration values. The synthesized cationic thiol polyurethane surfactants showed good antimicrobial activities against the tested microorganisms including Gram positive, Gram negative as well as fungi. The synthesized compounds were tested for the activity as corrosion inhibitors against carbon steel corrosion in 2N H 2 SO 4 at 50, 100, 200, 400 and 600 ppm. The inhibition efficiencies of the tested compounds showed good inhibition and protection of the carbon steel. The corrosion inhibition tendency correlated to the surface activity and chemical structure of the compounds.Keywords: Cationic surfactants, Surface activity, Adsorption , Antimicrobial activity, Corrosion inhibition, Polyurethane. IntoductionCorrosion inhibitors are added to prevent metal dissolution during its surface cleaning from oxides and other adherent materials [1]. Also, corrosion inhibitors may be liquids or powder form that effectively reduces the corrosion rate by adsorbing on the metal surface [2,3]. Corrosion inhibition efficiency of organic compounds is related to their adsorption properties [4]. Corrosion protection of steel in acidic media is of great importance for both industrial facilities and theoretical aspects [5]. The adsorption of these molecules depends mainly on certain physicochemical properties of the inhibitor molecule such as the presence of heteroatoms including: oxygen, sulfur, nitrogen atoms and multiple bonds in the molecule through which they are adsorbed on the metal surface [6][7][8][9][10].Heteroatoms such as nitrogen, oxygen, and sulfur are capable of forming coordinate covalent bond with metal owing to their free electron pairs and thus acting as inhibitor. Compounds with π bonds generally exhibit good inhibitive properties due to the interaction of π orbital with metal surface [11][12][13]. The selection of a suitable inhibitor for a particular system is a difficult task because of the selectivity of the inhibitors and wide variety of corrosive environment. As a result, several types of corrosion inhibitors were developed to fit the different types of corrosion processes and also the medium where the corrosion takes place. Cor...
A series of cationic polyurethane surfactants ] were synthesized by the reaction of alkyl bromoacetate (namely: octyl-, decyl-, dodecyl-, tetradecyl-, hexadecyl-, and octadecyl bromoacetate) as quaternizing agents and modified polyurethane contains tertiary amine species. Modified polyurethane was prepared by the reaction of toluene diisocyanate (TDI) and triethanol amine monomercaptoacetate. The chemical structures of the prepared surfactants were confirmed using elemental analysis, Fourier transform infrared spectroscopy (FTIR), and Proton nuclear magnetic resonance ( 1 H NMR) spectroscopy. The molecular weight measurements of the prepared polymers showed that the segments of each polymer contain average 10 units of the urethane-triethanol amine mercaptoacetate. The surface activities of the prepared surfactants including: surface tension (γ), effectiveness (π cmc ), concentration at micelle formation (CMC), efficiency (Pc 20 ), maximum concentration at the interface (Γ max ), and the average area occupied by each surfactant molecule at the interface at equilibrium (A min ) of surfactants solutions were established at 25 C. The surface tension and the critical micelle concentration values of the prepared surfactants were gradually decreased by the gradual increase of their alkyl chain length. The prepared cationic surfactants showed efficient activity as inhibitors for dissolution of carbon steel in an acidic medium and also as a biocide against the growth of bacteria, fungi, and yeast.
Five series of cationic polysaccharide Schiff bases surfactant [AQ 10-18 ] were synthesized by the reaction between different five Schiff bases (which prepared by condensation of fatty amine namely: decyl, dodecyl, tetradecyl, hexadecyl and octadecyl amine and 4-pyridine carboxaldehyde) and polysaccharide sulfate as quaternizing agent. Also, their complexes with different transition metals including Ni 2+ , Co 2+ , Cu 2+ and Fe 3+ were synthesized. The chemical structures of these surfactants were confirmed using elemental analysis, FTIR spectra, UV spectra, 1H-NMR and atomic absorption spectroscopy. The studied surfactants were evaluated as antimicrobial agents against pathogenic and sulfate reducing bacteria using inhibition zone diameters. The synthesized cationic polysaccharide Schiff bases surfactant showed good antimicrobial activities against the tested microorganisms including Gram positive, Gram negative, yeast and fungi. The effect of the structure of these cationic surfactants and their metal complexes of Ni 2+ , Co 2+ , Cu 2+ and Fe 3+ on the cell membrane is discussed as well as their potent action on the targeted bacteria, yeast and fungi.
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